Abstract
A device for fibers strand axial thermal conductivity measurement has been designed and modeled by finite elements and realized. The method is based on Fourier's law in steady state and is inspired by the widely spread guarded hot plate method. This device has been designed to measure thermal conductivity on a wide range from 0.1W/(m.K) to 100W/(m.K) which represent the range of thermal conductivity found in fibrous materials. The numerical study has shown that radiative heat losses can reach the same order of magnitude than the researched conductive heat flux if no care is taken but are minimized when the temperature difference applied on the sample is centered on the temperature of the wall of the vacuum chamber enclosing the device. Measurements of thermal conductivity have been realized on three samples of bulk materials representative of the measurement range and on commercially available carbon fibers strands T300. The results are in good agreement with the values found in the literature and validate this device.
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